Upper critical magnetic fi eld of KxFe2-ySe2 and Eu0.5K0.5Fe2As2 single crystals
- Gasparov, V.A.
- Audouard, Alain
- Drigo, Loïc
- Rodigin, A.I.
- Lin, C.T.
- Liu, W.P.
- Zhang, M.
- F. Wang, A.
- Chen, X.H.
- Jeevan, H.S.
- Maiwald, J.
- Gegenwart, P.
DOIAbstract
International audienceThe H-T phase diagrams of single crystalline electron-doped K0.83Fe1.83Se2 (KFS1), K0.8Fe2Se2(KFS2) and hole-doped Eu0.5K0.5Fe2As2 (EKFA) have been deduced from tunnel diode oscilla-tor-based contactless measurements in pulsed magnetic fields up to 57 T for the inter-plane (H//c) and in-plane (H//ab) directions. The temperature dependence of the upper critical mag-netic field Hc2(T) relevant to EFKA is accounted for by the Pauli model including an anisotropic Pauli paramagnetic contribution (BHp=114 T for H//ab and 86 T for H//c). This is also the case of KFS1 and KFS2 for H//ab whereas a significant upward curvature, accounted for by a two-gap model, is ...
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